Test Scenario Creation for 6000 users in 1hour

I have requirement of testing the performance of my application where we expect 6000 users will visit in 1 hour. Can you help me creating Test Volume for this scenario. Which Test Volume would be most appropriate, Fix User or Ramp Up or Periodic Load?

Also on the other hand machine configuration of WAPT Machine is 2.6Ghz CPU, 2GB of RAM and 1.5Mbps banwidth. Would this suffice the need of my test scenario?